Safety gas cut-off.



H. TULLIS.

SAFETY GAS GUT-OFF.

APPLIOATION FILED MAY 19. 1909.

942,601 Patented Dec. 7, 1909.

Ham/y Tu Z Z is @im By wom M ATTORNEYS HARVY TULLIS, 0F LISBON, OHIO.

SAFETY GAS CUT-OFF.

Specification of Letters Patent.

Patented Dee. 7, 1909.

Application led May 19, 1909. Serial No. 496,929.

To all whom tt 'may concern:

Be it known that I, HARVY TULLis, a citizen of the United States, andresident of Lisbon, in the county of Columbiana and State of Ohio, haveinvented a certain new and useful Safety Gas Gut-Ott, of which thefollowing is a full, clear, and exact description.

lThe object which the present invention has principally in view is toprovide a mechanism for cutting off the supply of gas in t-he event ofthe same being inadvertently or otherwise temporarily suspended.

One embodiment of the invention is disclosed in the structureillustrated in the accompanying drawings wherein like characters otreference indicate corresponding parts in all the views.

Figure 1 is a side elevation of a gas pipe having attached thereto acut-off constructed in accordance with the present invention; Fig. 2 isan end elevation of the same; Fig. 3 is a vertical longitudinal` sectionof the same, showing the valve in its open position; Fig. 4 is a crosssection ot the same taken on the line 1 4 in Fig. 3; and Fig. 5 is avertical longitudinal section of the cutotf, t-he valve being shown inits closed position.

A great deal of disaster and discomfort has been experienced in thepast, due to the accidental or intentional suspension of gas service inbuildings, and the renewal of the same after the light has becomeextinguished, due to the suspension. Many cases of asphyxiation havebeen traced to this cause, as where aY person on retiring has left a gaslight burning, which through accidental suspension ol service has becomeextinguished, as a light, while the pipe remains open to permit the gasto tlow unburned into the chamber when the pressure is again renewed. Itis to avoid this action that I have provided the present invention,which consists in interposing between the pipe sections G and 7, adevice having a body portion 8, in which is formed a chamber 9, ofenlarged area to permit the movement of a valve 10 to and from its seat11. The valve 10 is tiXedly attached to a valve rod 12, which isguidably supported in a perforation formed in the end of an uprightguide rod 13. The guide rod 13 may be substituted by a spider castingsuitably secured in the body 8. The rod 12 is supported at the endopposite that which is mounted in the guide 13, by being pivotallyconnected with a rocking lever 1K1, pivoted in the body portion 8 at 15.The said lever when in the position shown in Fig. 3 of the drawings,holds the valve 10 in the position shown in said view, or raised fromthe seat 11. hen, however, the lever is moved to the position shown inFig. 5 of the drawings, the valve 10 is moved against the seat 11. Thecut-orf is placed between the pipes 6 and 7 in such manner that thevalve 10 is interposed between the source of gas and the seat 11, thegas iiowing in the direction shown by arrows in the drawings. The freeend of the lever 14 is connected by means of a connecting rod 16, to abellshaped member 17, mounted to inclose a small pipe 18, at the top ofwhich there is secured a washer 19, which prevents the escape of gasfrom the interior of the bellshaped member 17. The bell-shaped member 17is increased or decreased in weight by the use of rings 2O of variousweights, which are screwed upon the lower end of the bell-shaped member17. The rod 16 is secured to the upper end of the bell-shaped member 17by a connecting link 21.

Vith a device constructed as shown in the drawings and as hereindescribed the operation is as follows: Then the. device is inserted inthe system between the pipes 6 and 7, the pressure of the gas operatesto set the valve 10 on the seat 11. When both sections 6 and 7 of thepipe are secured to the device, the bell-shaped member 17 is raised byhand, removing the valve 10 from the seat 11. It is now calculated thatthe gas pressure which is permitted to enter through the pipe 18 intothe upper part of the bell-shaped member 17, will suspend the saidbell-shaped member in the position shown in Fig. 3 of the drawings. rFhemember 17 continues to stand in the position shown, until throughaccident or otherwise the pressure of the gas in the pipes G and 7 fallsbelow that pressure which is suiiicient to sustain the bellshaped member17. Thenever this happens, the member 17 falls to the position shown inFig. 5, throwing the lever 1st to the position shown, and closing thevalve 10 upon the valve seat 11. These parts are delicate in operation,and care is taken to provide against the corroding or adhesion of theparts, so that the action described is certain and requires little or noforce. When the valve 10 is seated, any subsequent renewal or increaseof pressure on the service side in the pipes, only operates to morelirmly seat the valve by pressing against the back thereof. Thisabsolutely closes the pipe .against the admission of gas beyond thevalve.

rlhe cut-off herein described is usually placed in the pipe system at ornear the meter or between the service and the burners.4 `When it isdesired to renew the service, it is necessary to manually raise themember 17, thereby removing the valve l0 from its seat and restablishingthe pressure throughout the pipes and on both sides of the valve 10.

While I have herein described this system as applicable to what is knownas gas lighting, and as more applic-able to municipal systems for thesupply of the same, it will be understood that the cut-off is applicableto use in gas supply systems wherein is used gasolene, or privatelycarbureted gas.

I-Iaving thus described my invention, I

claim as new and desire to secure by Letters Patent:

A safety gas cut-off, comprising a straight pipe section having a valvemounted to operate longitudinally therein, a rocking lever mounted insaid section adapted to open and close the said valve, a vertical pipeexten'- sion opening into the said pipe section on the delivery side ofthe said valve and forming an open communication from said section', aninverted closed end tube guidably mounted on said vertical extension andforming a gas tight sliding*I joint therewith, and a connection betweensaid rock-y

